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Marketable Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | $ 2,449,593 | $ 2,366,008
Gross Unrealized Gains |  | 38 | 167
Gross Unrealized Losses |  | (8,330) | (14,168)
Fair Value |  | 2,441,301 | 2,352,007
Add: Time deposits | [1] | 48,265 | 54,537
Marketable securities, Amortized Cost |  | 908,440 | 1,489,937
Marketable securities, Gross Unrealized Gains |  | 2 | 167
Marketable securities, Gross Unrealized Losses |  | (8,330) | (14,168)
Marketable securities, Fair value |  | 900,112 | 1,475,936
Cash and Cash Equivalents |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 1,589,418 | 930,608
Gross Unrealized Gains |  | 36 | 0
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | 1,589,454 | 930,608
Corporate debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 505,296 | 747,763
Gross Unrealized Gains |  | 0 | 148
Gross Unrealized Losses |  | (4,702) | (7,508)
Fair Value |  | 500,594 | 740,403
Money market funds and other |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 877,527 | 863,115
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | 877,527 | 863,115
Sovereign securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 11,008 | 17,293
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (89) | (151)
Fair Value |  | 10,919 | 17,142
U.S. Government agency securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 174,058 | 326,508
Gross Unrealized Gains |  | 2 | 16
Gross Unrealized Losses |  | (1,445) | (2,827)
Fair Value |  | 172,615 | 323,697
U.S. Treasury securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 881,704 | 411,329
Gross Unrealized Gains |  | 36 | 3
Gross Unrealized Losses |  | (2,094) | (3,682)
Fair Value |  | $ 879,646 | $ 407,650
Corporate and Government securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Investment portfolio, maximum maturity term |  | 3 years |
[1] | Time deposits excluded from fair value measurements.

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